<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>1-伪元素和伪类</title>
    <style>
        .phoneNumber::before {
            content: '\260E';
            font-size: 15px;
        }
    </style>
</head>

<body>
    <p class="phoneNumber">12345645654</p>
</body>

</html>